Well, Cthulhu Mythos Roguelike meets Minecraft
would be a better description but I didn't want a longer title.
Friend got it for me on Steam and I'm playing it. I've heard it's easy compared to other Roguelikes and at the moment it certainly is. I hope it gets more challenging later but I can live without the ball-breaking difficulty of other games. The Binding of Isaac
or FTL: Faster Than Light
may as well just randomly have you explode on the game's start for how slim your chances of winning are.
You appear to be an explorer who found an infamous library of occult lore and now you're trapped inside. The only way out is through books that take you to different realms of the Cthulhu Mythos, the first appearing to be Y'ha-nthlei. They also gave a free expansion adding the Mountains of Madness to the game.